Good morning, As we experience this summer heat, just a friendly reminder that we are now within the domain of ACI-305R Hot Weather Concrete. Hot weather concrete is defined as any combination of the following:

- High Ambient Temperature - High Concrete Temperature - Low Relative Humidity - Wind Speed; and - Solar Radiation

Curing boxes for initially cured samples should be kept between 60 and 80 degrees. If the initial 24 hour curing is at 100° F, the 28 day compressive strength of the test specimen may be 10 to 15% lower than is cured between 60 and 80 as required by ASTM C31. Potential problems in Hot Weather are:

- Increased water demand - Increased rate of slump loss and corresponding tendency to add water at the job site - Increased rate of setting, resulting in a greater difficulty with handling, compacting and finishing,

and a greater risk of cold joints - Increased tendency for plastic shrinkage cracking; and - Increased difficulty in controlling entrained air content.

When approved (by job EOR); the use of high range, water reducing and retarding admixtures and superplasticizers can provide significant benefits, producing a more workable concrete medium without adversely affecting the water/cement ratio, adding water reduces strength and upsets the W/C ratio of the approved mix design. When finishing concrete, particularly flat work, avoid rapid evaporation. Use of fog nozzles, wet burlap or other approved method to prevent moisture loss is essential. Please see on the following pages the American Concrete Institute Hot Weather Concrete Code, section ACI-305R. For further questions please contact our main office number 516-500-5900. Stay Cool and Hydrated! Sincerely, The Domani Inspection Team